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arXiv · 2105.09036

Mass-independent analysis of the stable isotopologues of gas-phase titanium monoxide -- TiO

Alexander A. Breier·Björn Waßmuth·Guido W. Fuchs·Jürgen Gauss·Thomas F. Giesen
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Abstract

More than 130 pure rotational transitions of $^{46}$TiO, $^{47}$TiO, $^{48}$TiO, $^{49}$TiO, $^{50}$TiO, and $^{48}$Ti$^{18}$O are recorded using a high-resolution mm-wave supersonic jet spectrometer in combination with a laser ablation source. For the first time a mass-independent Dunham-like analysis is performed encompassing rare titanium monoxide isotopologues, and are compared to results from high-accuracy quantum-chemical calculations. The obtained parametrization reveals for titanium monoxide effects due to deviations from the Born-Oppenheimer approximation. Additionally, the dominant titanium properties enable an insight into the electronic structure of TiO by analyzing its hyperfine interactions. Further, based on the mass-independent analysis, the frequency positions of the pure rotational transitions of the short lived rare isotopologue $^{44}$TiO are predicted with high accuracy, i.e., on a sub-MHz uncertainty level. This allows for dedicated radio-astronomical searches of this species in core-collapse environments of supernovae.

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Alexander A. Breier, Björn Waßmuth, Guido W. Fuchs, Jürgen Gauss, Thomas F. Giesen. 2021-05-19. Mass-independent analysis of the stable isotopologues of gas-phase titanium monoxide -- TiO. https://doi.org/10.1016/j.jms.2018.11.006

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